Duplicate Symbols for i386 Architecture

Question

I am using the GTL environment to use google GDrive. I copied all the files from the GTL.xcodeproject file to my application after a repeated failure while importing this structure into my application. But still I get below mentioned error. I searched for everyone, but did not find duplicate files or anything else. Please help here.

/Users/ashutoshb/Desktop/Screen Shot 2012-11-30 at 10.30.24 AM.png Ld /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Products/Debug-iphonesimulator/MowWom.app/MowWom normal i386 cd /Users/ashutoshb/Mowwom/MowWomCode/Updated/MowWom setenv IPHONEOS_DEPLOYMENT_TARGET 4.3 setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk -L/Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Products/Debug-iphonesimulator "-L/Users/ashutoshb/Mowwom/MowWomCode/Updated/MowWom/MowWom/Twitter+OAuth/Libraries & Headers" -L/Users/ashutoshb/Mowwom/MowWomCode/Updated/MowWom - F/Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom- dmhxeapzkbnuniegdxmsvdgmodrw/Build/Products/Debug-iphonesimulator - F/Applications/Xcode.app/Contents/Developer/Library/Frameworks - F/Users/ashutoshb/Mowwom/MowWomCode/Updated/MowWom -filelist /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom- dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug- iphonesimulator/MowWom.build/Objects-normal/i386/MowWom.LinkFileList -Xlinker - objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=4.3 -framework SenTestingKit -framework Security -framework MessageUI -lxml2 -lz -framework CFNetwork -framework MobileCoreServices -framework SystemConfiguration -framework CoreLocation -framework MapKit -framework QuartzCore -framework UIKit -framework Foundation -framework CoreGraphics -lOAuth -o /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Products/Debug-iphonesimulator/MowWom.app/MowWom duplicate symbol _OBJC_CLASS_$_GTLDriveAboutAdditionalRoleInfoItem in: /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDrive_Sources.o /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDriveAbout.o duplicate symbol _OBJC_METACLASS_$_GTLDriveAboutAdditionalRoleInfoItem in: /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDrive_Sources.o /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDriveAbout.o duplicate symbol _OBJC_CLASS_$_GTLDriveAboutExportFormatsItem in: /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDrive_Sources.o /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDriveAbout.o duplicate symbol _OBJC_METACLASS_$_GTLDriveAboutExportFormatsItem in: /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDrive_Sources.o /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDriveAbout.o duplicate symbol _OBJC_CLASS_$_GTLDriveAboutFeaturesItem in: /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDrive_Sources.o /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDriveAbout.o duplicate symbol _OBJC_METACLASS_$_GTLDriveAboutFeaturesItem in: /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDrive_Sources.o /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDriveAbout.o duplicate symbol _OBJC_CLASS_$_GTLDriveAboutImportFormatsItem in: /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDrive_Sources.o /Users/ashutoshb/Library/Developer/Xcode/DerivedData/MowWom-dmhxeapzkbnuniegdxmsvdgmodrw/Build/Intermediates/MowWom.build/Debug-iphonesimulator/MowWom.build/Objects-normal/i386/GTLDriveAbout.o duplicate symbol _OBJC_METACLASS_$_GTLDriveAboutImportFormatsItem in: 

Answer 1

Make sure that you also check "Compile Sources" in the "Build Phases" section. Sometimes they become twice as large (but appear only once in the project file explorer)

Answer 2

Try to delete all files / folders from your project location, as well as remove links from your Xcode project.

Then copy the library folder to the project location and in Xcode, click "Add Files ..." and select the newly added folder in the project location.